<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>体验jQuery</title>
</head>
<body>
    <script src="./jquery.js"></script>
    <script>
        /*
        当你引入jQuery文件以后
          + 会在全局暴露两个变量名
             =>$
             =>jQuery
        */

        console.log($)
        console.log(jQuery)
    </script>
</body>
</html>